b43jack Posted March 8, 2017 Share Posted March 8, 2017 Bought a new to me B61SX last week. The chassis had the cab removed and sat outside uncovered for 3 years. The main box shifter was stuck in netural position. The compound box seems to be fine and the linkage moves normally. So I took a compound shifter linkage off and removed the top cover of the main box transmission only to find more than surface rust on the top half of every gear. Can this trans be saved or is the surface hardening on all the gears gone from the rust? I have tried to attach photos of what I found, thanks Quote Link to comment Share on other sites More sharing options...
b43jack Posted March 8, 2017 Author Share Posted March 8, 2017 First photo Quote Link to comment Share on other sites More sharing options...
b43jack Posted March 8, 2017 Author Share Posted March 8, 2017 Second photo Will the 5 speed duplex , main box Gear set interchange with a quadrupleplex main box gear set? Any thoughts or ideas would be appreciated Quote Link to comment Share on other sites More sharing options...
theakerstwo Posted March 8, 2017 Share Posted March 8, 2017 If i had that and liked it i would tear it down and sand blast the gears and shaft then replace the brgs. 2 Quote glenn akers Link to comment Share on other sites More sharing options...
Hobert62 Posted March 8, 2017 Share Posted March 8, 2017 I think I was told on here a while back the TRD72 is the main box # and its the same. Quote Link to comment Share on other sites More sharing options...
thomastractorsvc Posted March 8, 2017 Share Posted March 8, 2017 (edited) I have never done this but thought of doing it before but found another gear box cheap. if you didn't want to take it out I would try and dissolve the rust. Fill it up with evaporate rust and dissolve it. Then after everything was dissolved rinse with a pressure washer and then soak in diesel/kerosene. Then flush a few times. Like I said I have never done it and if you don't have the tools or money to have someone else do it right now like Glenn said, I think for around a $100 you could try it. If you do post the results. https://www.evaporust.com/evapo-rust-rust-remover Edited March 8, 2017 by thomastractorsvc spelling 1 Quote Robert"I reject your reality and substitute my own." Link to comment Share on other sites More sharing options...
41chevy Posted March 8, 2017 Share Posted March 8, 2017 Is that a weld bead on the case above the gear cluster? Certainly looks like one. Paul Quote "OPERTUNITY IS MISSED BY MOST PEOPLE BECAUSE IT IS DRESSED IN OVERALLS AND LOOKS LIKE WORK" Thomas Edison “Life’s journey is not to arrive at the grave safely, in a well preserved body, but rather to skid in sideways, totally worn out, shouting ‘Holy shit, what a ride!’” P.T.CHESHIRE Link to comment Share on other sites More sharing options...
Freightrain Posted March 8, 2017 Share Posted March 8, 2017 Or just lots of sludge??? Looks like some nasty black stuff/lube in the bottom. Quote Larry 1959 B61 Liv'n Large...................... Charter member of the "MACK PACK" Link to comment Share on other sites More sharing options...
theakerstwo Posted March 8, 2017 Share Posted March 8, 2017 The rust may clean up but the brgs will not make it and if you run it and let the brgs go down the the gears will be toast. Quote glenn akers Link to comment Share on other sites More sharing options...
thomastractorsvc Posted March 9, 2017 Share Posted March 9, 2017 1 hour ago, theakerstwo said: The rust may clean up but the brgs will not make it and if you run it and let the brgs go down the the gears will be toast. I didn't think about the bearings if they are pitted or not. I was just thinking about the gear sets Quote Robert"I reject your reality and substitute my own." Link to comment Share on other sites More sharing options...
gearhead204 Posted March 9, 2017 Share Posted March 9, 2017 what do you plan to do with the truck? that will dictate what you need to do to the trans. if you are going to pull 80k better fix it right, if its going to run 2 miles a year thru the local parade well that's a good cleaning and several diesel flushes away from fixed. if some thing in between better glass bead the gears and replace any damaged bearings., the rear ends probably look about the same as well. better check the wheel bearings too ! 1 Quote Link to comment Share on other sites More sharing options...
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